High efficiency machining of GH4169D closed integral impeller by multi-electrode EDM
The impeller is one of the important core parts of the aircraft engine,and the nickel-base high temperature alloy GH4169D closed integral impeller is the most difficult one to process.The traditional EDM closed integral impeller is mainly limit-ed by low processing efficiency and low yield.Therefore,a multi-electrode and multi-variable adaptive control system for EDM was innovated and developed.According to the discharge state and processing environment during the machining process,the gap volt-age,tool lifting period and pulse closing time can be adjusted adaptively,which not only ensures the conditions for simultaneous machining of multi-electrodes,but also maintains an efficient inter-electrode processing environment.Under the condition of high energy discharge,multi-electrodes were used to process multiple flow paths of closed integral impeller at the same time.Under the condition of small energy discharge,the flow path profile after rough machining was trimmed by step machining method,which can not only improve the processing efficiency but also meet the requirements of machining surface quality.The experimental results show that in multi-electrode rough machining,the average processing time of single flow path profile is only 17 minutes,which is about 10 times higher than that of single electrode machining.In the multi-electrode finishing process,the surface roughness of the blade basin and the blade back is only 1.246 and 1.487 μm,respectively.The results show that the EDM multi-electrode and multi-variable adaptive control system can be widely used in the machining and manufacturing of closed integral impeller,which is of far-reaching significance.
closed integral impellernickel-base high temperature alloyElectrical Discharge Machining(EDM)multi-electrodeadaptive control
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